KONINKLIJKE AKADEMIE VAN WETENSCHAPPEN 

 TE AMSTERDAM. 



PROCEEDINGS OF THE MEETING 

 of Saturday January 31, 1914. 

 Vol XVI. 



President: Prof. H. A. Lorkntz. 

 Secretary: Prof. P. Zeeman. 



(Translated from: Verslag van de gewone vergadering der Wis- en Natuurkundige 

 Afdeeling van Zaterdag 31 Januari 1914, Dl. XXII). 



OOlsTTElSrTS. 



H. R. Kruyt : "Pseudoteniary systems of acid anliydrides and water. I. Flithalic anhydride." 



(Communicated by Prof. Erxst Coiien), p. 712. 

 J. BöESEivEN and P. E. Verkade : "The mechanism of the acid formation of aliphatic acid 



anhydrides in an excess of water". (Communicated by Prof. A. F. Holleman;, p. 718. 

 Jan de Vries : "Bilinear congruences and complexes of plane algebraic curves", p. 720. 

 Jan de Vries : "A bilinear congruence of twisted ([uartics of the first species'', p. 733. 

 F. A. H. Sciireinemakers : "Equilibria in ternary systems" XII., p. 739. 

 Pit. Koiinstamm and K. W. Walstra : "An apparatus for the determination of gas isotlierms 



up to about SOOO atms." (Communicated by Prof. J. D. van der Waals), p. 754. 

 L. KiTTTEN : "Elcphas anti(inns Falc. from the river "Waul near Nijmegen". (Communicated 



by Prof. A. Wiciimann), p. 769. 

 11. J. Backer: "On the nitration of mcthylurea". (Communicated by Prof. A. P. X. 



Franciiimont), p. 770. 

 A. 11. Blaavw : "The primary photo-growth reactions and the cause of the positive photu- 



tropism in Phycomyces nitens." (Communicated by Prof. F. A. F. C. Wentj, p. 774. 

 H. Kamkrlinoh Onnes and Albert Perrier : "Magnetic researches. X. Apparatus for the 



general cryomagnetic investigation oi substances of small susceptibility". (Continued), p. 780. 



" — - — 



Proceedings Royal Acad. Amsterdam. Vol. XVI. 



